- 6-75. See below:
- 26
- 29
- 9
- 6-91. See below:
- A = 12 un.2, P = 14 un.
- A = 10 un.2, P = 14 un.
- Answers vary, but should simplify to A = 3x un.2, P = 2x + 6 un.
- The last shape uses algebra tiles, so it is not possible to describe the “toothpicks” or “tiles” as a single number.
- Because x can represent different lengths, you cannot tell if the perimeter is greater or less than the perimeter of shape (a).
- 6-96. See below:
- 4x + 4 units
- 4x + 4 units
- 6-106. See below:
- P = 4x + 4 units, A = x2 + x + 1 square units
- P = 2x + 4 units, A = x + 1 square units
- P = 4x + 6 units, A = x2 + 2x + 1 square units
- 6-107. The picture should contain 5 x2‑tiles, 8 x‑tiles, and 3 unit tiles. A = 5x2 + 8x + 3 square units
- 6-110. See below:
- 21
- 14
- 22
- 6-115. See below:
- 32 units
- 26 units
- 13
units
- CL 6-121.
a. P = 4x + 6 units
b. A = x2 + 2x + 2 square units
c. The area would not change.
- CL 6-122.
a. 5 b. 16
c. 25 d. 4
- CL 6-126.
a. x2 + 7x + 2 b. 18x + 3
c. 3x2 + 3x + 8 d. 4x + 6
- 7-9. See below:
- $144 ÷ $36 = 4 sets of 4 hours, 16 hours
≈ 6.167 sets of 4 hours, 
hours- $360 for a 40-hour week, $63 for a 7 hour day.
- 7-19. See below:
- See sample graph below.
- Steeper, because she is traveling faster at
.
- See sample graph below.
- 7-30. See below:
- DWest, because it has a unit rate of $0.15/min.
- 7-31. See below:
- C
- $4 per pound
- Store A. Its line is steepest.
- 7-40. See below:
- 7-60. See below:
- 10
- 7-64. See below:
- 3.25
- 7-74. See below:
= 1
- 10
- 7-75. 12
- CL 7-131.
Eva is saving at a faster rate, because she saves $75 a week, while Annie saves about $72 a week.
- CL 7-133.
Values in the table are:
(6 cans, 10 dollars), (9 cans, 15 dollars), (27 cans, 45 dollars), (30 cans, 50 dollars)
- CL 7-135.
6 ÷ 
= 21 cupcakes
All answers taken from CPM ebook CC1